Machine for molding threaded objects.



E. W. ENGSTE'O'M. MAOHINE FOR MOLDING THREADED OBJECTS.

APPLICATION rum) APE.2, i909.

Patented June 21, 1910.

17 O INVENTOW 25 18 WITNESSES i FKOTO-LIYkOGRAPNE 2 UNITED STATESFATEFNT @FFIQE.

FRANS WILHELM ENGSTRfiM, OF NYBBO, SWEDEN.

MACHINE FOR MOLDING THREADED OBJECTS.

To all whom it may concern:

Be itknown that I, FRANS VVILHELIWI ENcs'rRoM, a subject of the King ofSweden, residing at Nybro, in the Kingdom of Sweden, have invented newand useful Improvements in Machines for Molding Threaded Objects, ofwhich the following is a specification, reference being had to thedrawing accompanying and forming a part hereof.

This invention relates to machines for manufacturing pots, jars, bottlesand other objects provided exteriorly or interiorly with threads forreceiving a correspondingly threaded cover, suitably of pressedsheet-metal, and the invention more particularly relates to themanufacturing of such objects of glass or other material adapted to beworked in molds.

Machines of this kind in which one mold part is adapted to be screwedaxially to ward and away from another part of the mold, and in which apress plunger is mounted in the one mold part in such a manner as to beable to move axially into and out of the mold, are before known, butthey do not work entirely automatically, several manipulations beingrequired, during working, in order to cause the different movements totake place in the desired sequence.

The chief object of the invention is to avoid the said drawback andprovide a machine having a considerably increased producing capacitymaking it possible to decrease the cost of manufacturing the articles tobe produced.

Further objects will hereinafter appear.

The invention consists, chiefly, in that the axially movable mold partand the press plunger are connected to the driving means in such amanner that the reversal of the movements of the several parts will takeplace automatically so that in working the machine no other manualoperations are to be performed than the pouring of the molten materialinto the molds and the removal of the molded objects.

The invention further comprises the construction and combination ofparts hereinafter more particularly described.

In the drawing, I have shown a machine embodying the invention.

Figure 1 is a side-view of the machine, Fig. 2 is a front view of thesame, partly in section, and Fig. 3 is a plan view of the Specificationof Letters Patent.

Application filed April 2, 1909.

Patented June 21, 1910.

Serial No. 487,424.

machine (partial section on line A-B of Fig. 1.)

Referring to the drawing, the apparatus shown is used for molding commonsmooth cylindrical glass-pots of the cross-section shown in Fig. 2,where the glass-pot has the reference numeral 1. The pot is shownprovided at the top with exterior threads for screwing on a cover. Thepart of the mold corresponding to the smooth part of the pot below thethreads is formed in a slide 2 adapted to be reciprocated in a guideformed in the machine frame 3. The movement of the slide is suitablyproduced by means of a cam 5 or the like attached to or made in tegralwith the driving shaft, said cam acting on the one arm of an angle lever7 fulcrumed at 6, the other arm of said angle lever being connected tothe slide 2 by means of a link 8, or otherwise. The slide is guided atthe top by a stationary part 9 of the machine frame. Screwed through thesaid part 9, from the top downward, is the threaded part 10 of the mold,the upper part of which forms a spur-wheel 11 adapted to be turned byany suitable means. In the embodiment shown the spur-wheel 11 is engagedby a spur-wheel 12 journaled at the part 9 of the machine frame, saidlatter wheel being rotated from shaft 14 by means of a bevel gear 13.The shaft 14 is rotated by spurwheels 15, 16, 17 18 from a swingingcog-segment 19 (Figs. 1 and 3). The cog-segment 19 is connected by aconnecting rod 20 to a cross-piece 22 movable on guides 21, saidcross-piece being connected by connecting rods 23 and cranks 24 to therotary shaft 4. The latter is rotated by means of a large spur-wheel 25which is suitably loosely placed on the shaft 4 to which it may beconnected by a clutch-part 26 movable along the shaft4by means ofalever27 It appears from the aforesaid that, when the cog-segment 19 engagingthe spur-wheel 18 is turned, the upper part 10 of the mold is turned andat the same time screwed within the part 9, so that, when the cogsegmentis swung downward, the part 10 is screwed on to the lower mold part 2.The relation is such that, when the part 10 has been screwed in to thepart 2, the cog-segment 19 releases the spur-wheel 18,by which, aseasily understood,'the part 10 is left at rest. This takes place acertain time before the cranks 24 have arrived at their lowermost deadpoint position, and from that moment the upper mold part 10 and itswhole driving mechanism is at rest while the plunger 28 connected to thecrosspiece 22 and passing through the mold part 10 continues downwardand descends into the liquid mass within the closed mold so that thesaid mass is forced into all parts of the mold and fills the same at thesame time as the plunger forms the inner cavity of the pot 1. Foraccurately guiding the plunger during its movement a further cross-piece29 is provided running on the guides 21, and, in order to provide for aresilient movement, when the cranks 24 pass their lower dead pointpositions, the cross-piece 22 is loosely placed on the plunger bar andsupported by a spring 30 placed 011 the said bar. This spring has alsothe very important function of accommodating the movement of the plunger28 if too large or too small a mass of glass has been filled into themold. Thus, for instance, if too large a quantity of glass has beenfilled in, the springy plunger yields, whereas, in case it were notspringy it would be pressed in so as to destroy both the glass objectand the mold. If, on the other side, too small a mass of glass has beenfilled in, the spring causes the plunger to penetrate so far into themold that the latter is completely filled. The yielding connection isespecially advantageous when the machine has two or more plungers andmolds, it being obviously impossible to always fill the molds quiteuniformly.

When the cranks 24 during their continued rotation move upward fromtheir lower dead point position, the cog-segment 19 again enters intoengagement with the wheel 18, whereby the mold part 10 is turned in theopposite direction, 2'. ve. it is screwed away from the mold part 2,thereby following the cast threads of the glass-pot 1. At the same timethe plunger 28 moves upward, and when the upper mold part and theplunger have both arrived in positions quite above the glass-pot 1, thecam 5 acts on the lever 7 so that the lower mold part 2 with theglass-pot placed in it is moved forward into a position in which theglass-pot may be removed. To this end the lower mold part 2 has placedinto it, just below the mold, a piston 31 supported at its lower end bymeans of a lever 32 adapted to press the piston upward through thebottom of the mold. The other arm of the lever 32 projects forwardly andis connected to a spring 33 tending to swing the said arm upwardly. Bypressing down the outer arm of the lever the piston 31 and thereby theglass-pot is raised. r

In order that the glass-pot placed in the mold shall not turn with theupper part of the mold, when the latter is screwed upward,

the lower mold part has projecting into it a laterally movable pin 34the inner end of which projects into the mold and thus into the outerside of the cast glasspot. The pin 34 must thus be retracted before thepot can be pressed out of the mold. To this end the outer end of the pinis provided with an oblong slot, and projecting through the said slot isthe upper, obliquely extending end of a bar 35 the lower end of which ispivotally attached to the lever 32. The bar 35 is suitably guided in apart- 36 attachedto the front side of the lower mold part 2. Then thelever 32 is depressed, the bar 35 is moved downward and thereby actswith its upper, obliquely extending part on the pin 34 so that thelatter is retracted before the piston 31 raises the cast glass-pot.

In order to increase the productivity of the machine, two or more moldsconstructed and arranged substantially as hereinbefore described may beemployed.

Though in the embodimentrdescribed I have shown the threaded mold partarranged to be screwed down upon the other mold part, it is obvious thatthe firstmentioned mold part may be stationary and the other mold partarranged to be screwed into close contact with the former, the essentialfeature being that the two mold parts are arranged in such a manner thata relative movement may be imparted to the sameequivalent to thathereinbefore described, the pitch of the screwing movement being in anycase equal to the pitch of the threads of the mold or the object to bemolded.

I claim:

1. A machine for molding threaded objects, comprising a mold partadapted to receive the non-threaded part of the object to be produced, athreaded mold part adapted to receive the threaded part of the saidobject, means comprising a set of gear-wheels for screwing thesaidlatter mold part into close contact with the former, a plunger movablethrough the threaded mold part into and out of the mold, said plungerforming a core for the object to be molded, a swinging segment engagingone of the said gear-wheels during a part of its swinging movement, anda connection between the said segment and the plunger causing the latterto move farther into the mold after the segment has moved, in a certaindirection, out of engagement with its corresponding gear wheel.

2. A machine for molding threaded objects, comprising a slide containinga mold part adapted to receive the non-threaded part of the object to beproduced, a threaded mold part adapted to receive the threaded part ofthe said object, means for screwing the saidmold partsinto close contactwith each other, a plunger movable through the threaded mold part intoand out of the mold means for causing the said plunger to move in such amanner that, when the mold parts have been screwed together, the plungermoves farther into the mold and presses the mass therein into all partsof the same, and means for automatically imparting to the slidecontaining the non-threaded mold part a lateral movement in relation tothe other mold part, when the latter and'the plunger have been entirelyretracted.

3. A machine for molding threaded objects, comprising a slide containinga mold part adapted to receive the non-threaded part of the object to beproduced, a threaded mold part adapted to receive the threaded part ofthe said object, means for screwing the said mold parts into closecontact with each other, a plunger movable through the threaded moldpart into and out of the mold, means for causing the said plunger tomove in such a manner that, when the mold parts have been screwedtogether, the plunger moves farther into the mold and presses the masstherein into all parts of the same, means for moving the slidecontaining the non-threaded mold part laterally in relation to the othermold part when the latter and the plunger have been entirely retracted,a piston placed in the slide, below the mold, and adapted to be movedinto and out of the said mold, the end of the piston forming the bottomof the said mold, and means for moving the said piston into the mold andthereby pressing out the molded object when the slide has been movedlaterally in relation to the retracted plunger.

4. A machine for molding threaded objects, comprising a mold partadapted to receive the non-threaded part of the object to be produced, athreaded'mold part adapted to receive the threaded part of the saidobject, means for screwing the said mold parts into close contact witheach other, a plunger movable through the threaded mold part into andout of the mold, means for causing the said plunger to move in such amanner that, when the mold parts have been screwed together, the plungermoves farther into the mold and presses the mass therein into all partsof the mold, and a pin movably mounted in a passage in the wall of thenon-threaded mold part and adapted to project with its inner end intothe mold;

5. A machine for molding threaded ob jects, comprising a slidecontaining a mold part adapted to receive the non-threaded part of theobject to be produced, a threaded mold part adapted to receive thethreaded part of the said object, means for screwing the said mold partsinto close contact with each other, a plunger movable through thethreaded mold part into and out of the mold, means for causing the saidplunger to move in such a manner that, when the mold parts have beenscrewed together, the plunger moves farther into the mold and pressesthe masstherein into all parts of the same, means for moving the slidecontaining the non-threaded mold part laterally in relation to the othermold part when the latter and the plunger have been entirely retracted,a piston placed in the slide, below the mold, and adapted to be movedinto and out of the said mold, the end of the piston forming the bottomof the said mold, a pin movably mounted in a passage in the wall of theslide and adapted to project with its inner end into the mold, a barmounted on the slide in such a manner as to be able to move at an angleto the said pin, said bar engaging the pin so as to pull it out of themold, when the bar is operated, and means for operating the said bar andthe bottom piston of the mold, when the slide has been moved laterallyin relation to the retracted plunger, so that the pin is first withdrawnfrom the mold and the piston is thereupon raised to press the moldedobject out of the mold.

FRANS WVILHELM ENGSTROM.

Witnesses AUG. Sonnnsmv, FREDR. NORDSJD.

